Who doesn't love a good zoo? The animals, for one. Many of the most popular attractions at zoos are animals like tigers and bears, who are particularly prone to boredom and depression when cooped up. That's why some people want to close traditional zoos and take a different approach.

The "lost" city of Atlantis has never truly been verified, but its existence persists in the minds of some, including author Mark Adams. But Adams points to new information he says makes it more likely at least part of the story is true.

The search is on for planets that could harbor life, but many of the candidates that we can see are more like gassy Jupiter than rocky Earth. But those planets may be home to rocky moons that can sustain life themselves

In the world of science, there are the experts and the "experts." The "experts" are in the pockets of corporations and special interest groups — and their primary goal is to sow doubt in the minds of the public.

The Kepler Space Telescope is on the hunt for potentially habitable planets, but even the most "Earth-like" planets can look dramatically different than our home. One of them, Kepler-438b, is a case study in just how tough finding a second Earth can be.

The killing of a homeless man by Los Angeles police added yet another incident to the list of high-profile police killings that have rocked the US over the last year. Now the Justice Department is issuing reports and recommendations on police bias, hoping to help repair relations between officers and citizens.

The Ebola epidemic has slowed to a trickle in Liberia, and the American soldiers who helped with the medical response effort have ended their missions. But aid workers caution that vigilance — and more infrastructure — is still needed.

Minority voters once faced poll taxes, tests and other blatant methods of keeping them away from the polls. But while those methods are gone, political science says voter discrimination is now simply more subtle — and possibly more widespread.

The number of college graduates with debt is rising quickly, and some students have had enough. A group known as the Corinthian 15 say they're going on a "debt strike," hoping to force action to cancel the debts they owe to a for-profit education company — and spur broader change.